The Stoneklaw is really good but i can guess it can also be really bad, with the randomness to it, I will be taking it in my list until we hopefully get a tome, I went to a tournament on Saturday and used a pure Moonclan army, I didn't know you could stack the warboss command on the same unit of grots for crazy damage, I do know and can't wait to see how funny it is. With having certain perks with the Stoneklaw Alliegence i think that would be rather amazing, the ambush, preemptive attacks and reinforcements are what strike out to me the most i have put my list below.
Heroes
1 Warboss with Moon Prodder and Cave squig - Rockeye artefact -
1 Warboss riding squig with a spear
3 shamans with the mushroom pots
1 Fungoid Cave Shaman
Units
20 Cave Squigs
20 Save Squigs
60 Grots (9 nets, 1 gong, 1 bad moon icon & rest are spears)
10 Squig Hoppers
Behemoths
Colossal Squig (5 extra yellow Squigs inside ready to pop out)
Artillery
Spear Chukka (allies)
Spear Chukka (Allies)
Having these perks are really good as my list doesn't have a tome or any battalions so my 13 drops will always put me playing second which can be a huge drawback especially against certain armies like Tzeench as they have the Gaunt Summoner who can almost one shot my unit of grots with his spells that do mortals on a 4+ or even an army who can dish out a lot of shooting with rend of -1 or -2 which goes through all of my saves im sure.
But any buff or bonuses like Stoneklaw stratagems are more than welcome as we don't have a tome yet.
This list also came 6/17 winning 2/3 games on Saturday at Justplay Liverpool, i beat Khraradron overlords and Deepkin